Device for determining the shearing strength of the bordering layer of sand molds and cores

Claim 1

IN AN APPARATUS FOR USE IN CONNECTION WITH A TEST BODY MADE UP OF FOUNDRY SAID TO BE INVESTIGATED AND COMPRISING AN ANNULAR MEMBER CONFINING AN END LAYER OF SAID TEST BODY, WHICH INCLUDES: HOLDING MEANS FORMING A CHAMBER FOR RECEIVING AND HOLDING SAID TEST BODY WHILE LEAVING A PORTION THEREOF PROJECTING FROM THE HOLDING MEANS DISPOSED IN SAID ANNULAR MEMBER WITH THE END SURFACE LAYER THEEOF EXPOSED, HEATING MEANS MOVABLE SELECTIVELY INTO CLOSE RELATIONSHIP WITH SAID EXPOSED END SURFACE OF SAID TEST BODY FOR SUBJECTING SAID END SURFACE TO SUDDEN HEAR OF AT LEAST 1067*F. FOR A SELECTED TIME TO CREATE A CRUST ON THE TEST BODY CONFINED BY SAID ANNULAR MEMBER AND RELATIVELY HARD WITH REGARD TO THE REMAINDER OF THE FOUNDARY SANK MAKING UP SAID TEST BODY, POWER OPERABLE MEAND OPERABLE TO ENGAGE AND MOVE SAID ANNULAR MEMBER IN ITS OWN PLANE AND IN A DIRECTION LATERAL TO THE TEST BODY SO AS TO SHEAR OFF THE PORTION OF THE TEST BODY WITHIN SAID ANNULAR MEMBER FROM THE REMAINDER OF SAID TEST BODY, AND FORCE-REPONSIVE MEANS FOR MEASURING CONNECTED TO SAID POWER OPERABLE MEANS FOR MEASURING THE FORCE REQUIRED FOR SAID SHEARING-OFF OPERATION.